Transcript 09_Clicker_Questions

Chapter 9
Patterns of Inheritance
Clicker Questions for use with Classroom Response Systems
Campbell Essential Biology, Fourth Edition
– Simon, Reece, and Dickey
Campbell Essential Biology with Physiology, Third Edition
– Simon, Reece, and Dickey
Questions prepared by Brad Williamson, updated by Mike Tveten
© 2010 Pearson Education, Inc.
Concept Check
The figure diagrams one of the genetic crosses that helped Mendel
form his theories of inheritance. Which process distributes the “P”
allele to approximately one half of the F1 gametes and the “p” allele
to the other half?
a. independent assortment
b. mitosis
c. meiosis
d. chromosome crossover
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Concept Check
Mendel’s principle of independent assortment holds true only
for traits with genes that
a. are close together on homologous chromosomes (linked).
b. are on separate chromosomes (unlinked).
c.
have loci far apart on homologous chromosomes.
d. Both b and c are correct.
© 2010 Pearson Education, Inc.
Concept Check
The traits studied by Mendel were mostly discrete traits with two
phenotypes. Many traits such as human height vary continuously.
Which of the following describes the inheritance of continuously
varying traits using Mendel’s rules of inheritance?
a. Two or more genes interact
to produce the variation in
the trait apparent in the
population of the organism.
b. Two or more alleles interact
to produce the variation in
the trait apparent in the
population of the organism.
c. Mendel’s principles do not
apply to continuously varying
traits.
d. Traits with continuous
variability are not influenced
by heredity.
© 2010 Pearson Education, Inc.
Interpreting Data
Trichomes are small plant hairs.
The first graph represents the
distribution of trichomes along
the petiole (stem) of the first
true leaf in a population of
Wisconsin Fast Plants (Brassica
rapa). Which of the following
inheritance patterns would most
likely lead to results such as
these?
a. pleiotropy
b. multiple alleles
c. incomplete dominance
d. polygenic inheritance
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Interpreting Data
Students selected the top 15%
of hairy plants as parents for the
second generation of plants.
The results of these crosses are
graphed at the right. Which of
the following is a conclusion
consistent with the data?
a. The results of the selection
experiment support the
hypothesis that inheritance
of trichomes in Fast Plants
is polygenic.
b. The results of the selection
experiment do not support
the hypothesis that
inheritance of trichomes in
Fast Plants is polygenic.
© 2010 Pearson Education, Inc.
Interpreting Data
The students decided to carry
out the investigation for one
more generation. Again, they
selected the top 15% of the
hairy plants as parents. Which
of the following results would be
consistent with the hypothesis
that the inheritance of trichomes
is polygenic?
a. The distribution and mean
number of hairs continue to
shift to the right.
b. The distribution narrows
but the mean does not
shift.
c. The distribution curve
spreads out but the mean
does not shift.
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Biology and Society
Every state screens newborn infants for certain metabolic disorders
such as phenylketonuria (PKU). The March of Dimes recommends that
every newborn be tested for nine different metabolic disorders as well
as hearing. DNA technology has opened up several additional tests that
could be run for other genetic disorders. Do you think that states
should shoulder the responsibility of expanding the number of
newborn screening tests to include all of the relatively common
disorders?
Strongly
Agree
A.
© 2010 Pearson Education, Inc.
B.
C.
D.
E.
Strongly
Disagree
Biology and Society
Assume that you have a history of Huntington’s chorea in your family.
(Though the disease is not common, obviously there’s a chance that for
a few of you this is a very real dilemma.) Huntington’s is a fatal
condition that strikes during middle age and is inherited as a dominant
trait—you only need one copy of the HD allele. Today, DNA screening
tests are available but currently there is no way to stop the course of
the disease. Some people at risk take the test—others do not. Would
you take the screening test for Huntington’s if you were at risk?
Strongly
Agree
A.
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B.
C.
D.
E.
Strongly
Disagree
Biology and Society
Early in the history of genetics a movement developed known as
eugenics. The goal of eugenics was to “breed” a better human race by
using social pressures to encourage reproduction for those with “good”
genes and discourage those with “bad” genes. Eugenics led to bad
legislation in the United States and eventually was used by the Nazis in
Europe to justify many of their atrocities. Today, genetic research is
providing ever-greater detail into the workings of each and every one of
us, including genetic influences on behavior and personality. For some
this is an opportunity to fully realize our individual potentials; for others
this research dredges up memories of eugenics. As a member of
society, do you think it is important to heed the lessons to be
learned from eugenics as we explore more deeply into the
genetics of human beings?
Strongly
Agree
A.
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B.
C.
D.
E.
Strongly
Disagree